Jersey City, NJ's night sky, measured from orbit
Satellite radiance puts Jersey City in the inner-city band. Among the brightest skies in this dataset. Usually just the Moon and a few of the brightest stars or planets cut through. That's brighter than 99.1% of the 3,206 US cities in this dataset.
Note the source: a satellite reading of upward light, not a visual Bortle scale reading. The two measure related but different things.
How far Jersey City is from a meaningfully darker sky
The closest place in this dataset with a meaningfully darker sky is Hoboken, NJ, roughly 3 miles away in a straight line, rated urban. Road distance will be more.
Hoboken, NJ is itself still a measured city, not a designated dark-sky park, this only compares against the 3,206 places this dataset covers.
How Jersey City compares nationally
About 302,824 people live in Jersey City, NJ, sized enough to appear in this dataset of 3,206 incorporated US cities. Jersey City places 3,159 of 3,206 cities in this dataset's darkest-to-brightest order.